Magnetoelectric properties of lead‐free Li_0.06K_0.47Na_0.47NbO₃CoFe₂O₄ nanocomposite films fabricated by a one‐step chemical process

Abstract

Lead-free composite thin films composed of Li 0.06 K 0.47 Na 0.47 NbO 3 and CoFe 2 O 4 were prepared using a one-step chemical method. By analysis using X-ray diffraction, thermogravimetry (TG), and differential scanning calorimetry, it was found that the Li 0.06 K 0.47 Na 0.47 NbO 3 and CoFe 2 O 4 phases were crystallized at different stages of the thermal treatment, which resulted in the formation of a composite structure. The phase segregation was confirmed by observations on scanning electron microscopy and magnetic force microscopy. By electrical and magnetic measurements it was found that the composite showed a coupled magnetoelectric behavior at room temperature with a magnetoelectric coefficient of $185 mV/cm Á Oe.